Fix missing kvobj reassignment after reallocation in MOVE command (#14233)

Introduced by https://github.com/redis/redis/issues/13806

Fixed a crash in the MOVE command when moving hash objects that have
both key expiration and field expiration.

The issue occurred in the following scenario:
1. A hash has both key expiration and field expiration.
2. During MOVE command, `setExpireByLink()` is called to set the
expiration time for the target hash, which may reallocate the kvobj of
hash.
3. Since the hash has field expiration, `hashTypeAddToExpires()` is
called to update the minimum field expiration time

Issue:
However, the kvobj pointer wasn't updated with the return value from
`setExpireByLink()`, causing `hashTypeAddToExpires()` to use freed
memory.

src/db.c

@@ -1975,7 +1975,7 @@ void moveCommand(client *c) {
 
     dbAddByLink(dst, c->argv[1], &kv, &dstBucket);
     if (expire != -1)
-        setExpireByLink(c, dst, c->argv[1]->ptr, expire, dstBucket);
+        kv = setExpireByLink(c, dst, c->argv[1]->ptr, expire, dstBucket);
 
     /* If object of type hash with expiration on fields. Taken care to add the
      * hash to hexpires of `dst` only after dbDelete(). */

tests/unit/type/hash-field-expire.tcl

@@ -616,6 +616,7 @@ start_server {tags {"external:skip needs:debug"}} {
             r select 9
             r flushall
             r hset myhash field1 value1
+            r expireat myhash 2000000000000 ;# Force kvobj reallocation during move command
             r hpexpire myhash 100 NX FIELDS 1 field1
             r move myhash 10
             assert_equal [r exists myhash] 0